From an article about Flying With Children (Yours or Theirs):
On another occasion, a woman who was among the last to board could not find space in the overhead bins for her bulging carry-on bag. “When she opened the compartment and saw my kids’ backpacks, she pulled them out and said, ‘Children don’t need overhead space,'” Ms. Reiss said. She managed to settle the matter quietly — which, I might add admiringly, is more than I would have done in a similar situation.